Question

what changes do we observe when a chemical reaction occur ​

Answer 1

Answer:

A chemical reaction is usually accompanied by easily observed physical effects, such as the emission of heat and light, the formation of a precipitate, the evolution of gas, or a color change.

please follow me

Answer 2

Explanation:

A chemical reaction is usually accompanied by easily observed physical effects, such as the emission of heat and light, the formation of a precipitate, the evolution of gas, or a color change.

I CAN INBOX YOU FRIENDS